1.84% is the change from 815 to 830
Calculation steps:
[( 830 - 815 ) ÷ 815] x 100 = 1.84%
Formula
Percentage change = [(830 - 815) / 815] x 100
Subtract the new number by the original number
830 - 815 = 15
15 ÷ 815 = 0.018404907975460124
0.018404907975460124 x 100 = 1.84%